Short-Term Credit Arrangements and Borrowings (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,975
Amounts Outstanding	506
Net availability	1,469
DTE Energy [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	1,375
Amounts Outstanding	279
Net availability	1,096
DTE Electric [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Amounts Outstanding	11
Net availability	289
DTE Gas [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Amounts Outstanding	216
Net availability	84
Letter of Credit [Member]
Availability under combined facilities
Amounts Outstanding	235
Letter of Credit [Member] | Unsecured letter of credit facility expiring in May 2014 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	50
Letter of Credit [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	125
Letter of Credit [Member] | DTE Energy [Member]
Availability under combined facilities
Amounts Outstanding	235
Letter of Credit [Member] | DTE Energy [Member] | Unsecured letter of credit facility expiring in May 2014 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	50
Letter of Credit [Member] | DTE Energy [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	125
Letter of Credit [Member] | DTE Electric [Member]
Availability under combined facilities
Amounts Outstanding	0
Letter of Credit [Member] | DTE Electric [Member] | Unsecured letter of credit facility expiring in May 2014 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | DTE Electric [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | DTE Gas [Member]
Availability under combined facilities
Amounts Outstanding	0
Letter of Credit [Member] | DTE Gas [Member] | Unsecured letter of credit facility expiring in May 2014 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Letter of Credit [Member] | DTE Gas [Member] | Unsecured letter of credit facility expiring in August 2015 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	0
Revolving Credit Facility [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	1,800
Revolving Credit Facility [Member] | DTE Energy [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	1,200
Revolving Credit Facility [Member] | DTE Electric [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Revolving Credit Facility [Member] | DTE Gas [Member] | Unsecured revolving credit facility expiring in April 2018 [Member]
Availability under combined facilities
Line of Credit Facility, Maximum Borrowing Capacity	300
Commercial Paper [Member]
Availability under combined facilities
Amounts Outstanding	271
Commercial Paper [Member] | DTE Energy [Member]
Availability under combined facilities
Amounts Outstanding	44
Commercial Paper [Member] | DTE Electric [Member]
Availability under combined facilities
Amounts Outstanding	11
Commercial Paper [Member] | DTE Gas [Member]
Availability under combined facilities
Amounts Outstanding	$ 216